DeViOuSwOn

Well the mods I have are in my sig... Will have a tire soon but am still trying to decide on a str. I have 2.73's and will not be changing it. My original plan was to go with a 2.5. Few guys who have 2.73's have been telling me to go with a 2.8. Fuddle has told me to go with a 2.2(seems kinda low considering my gay *** gear size)

What do you guys think?

s346k

iTrader: (4)

you are aware of what the str means, right? a higher str will hit harder, making traction harder to get. with your gears i wouldn't go any higher than 2.5. not to mention that your tranny won't like any str over stock without torque management.

ponyeater01LS1

i ha fuddle 3600 2.2 i need a tune though 60 ft times went from 2.02 to a 1.80. 1/4 time was stock 12.91 after stall was 13.10 best after tune i should be mid to low 12s

DeViOuSwOn

So you guys would say the 2.5 MAX?

DevonsZ

iTrader: (20)

I went with the 2.2 and have 3.23's and thats seems to hit good so I would guess a 2.5 would be good for your 2.73's.

gator's 99TA

iTrader: (2)

you cant just "ask" for more str. str is a ratio or a rating. whatever combination you need rpm flash wise is most important. the str is determined by the combination of convertor size and flash rpm desire at the expense of efficiency. you fellas are confusing the tech aspect of the stall converter. if you want a hard hitting, efficient converter, you need a small 9.5" clutch. but they you will have a large (rpm) stall.

its impossible to get a high str without a high rpm flash point yet keeping efficiency within range.

DeViOuSwOn

So would a 3600 2.2 be good for the gear I have and mods?

DeViOuSwOn

I also do not want to be replacing a trans anytime soon.

LS1-450

iTrader: (33)

If you want to save the transmission, get 3.42's or 3.73's in the rear end, buy a 3200-2.0 torque converter, & install an 18,000 GVW or higher transmission cooler. Also, hope that any engine modifications don't exceed a flywheel torque of 350-375 #-ft or less (this should be within the service factor of the transmission (maybe)).

gator's 99TA

iTrader: (2)

1) talk to the convertor builder
2) pick your stall size needed (powerband, shift point, shift extension, gearing, weight)
3) pick your convertor size (for efficiency issues)
4) the str will be taken care of.

you guys are missing the point of my post. str is a theoretical number achieved when you put a certian sized converter clutch and stall rating (for a given amount of tq and rearend gearing).

MNR-0

Yup. You can't pick a converter on STR alone, just like you can't pick a cam on LSA alone. For a DD you want matched STR, not higher or lower for the sake of it, and within reason. Ideally, you want the most efficient, best road feel converter you can get for the stall speed you want. You need to match it to your cars power band, when it comes on cam, what you intend buying it for, will you be towing etc..

You can have a 3600/2.2 and 3600/1.6. The 2.2 would feel way better on the street and at the lights, netting you a better 60'. Why do ppl. go for lower STR? Because their needs are different, for example, a turbo that needs high RPM efficiency but spool RPM for launch. A 2.2STR is pretty high and going any higher you WILL sacrifice efficiency and horsepower to the wheels for a better launch - if you can hold it.

I have a 3400/2.1STR converter and it is about as high as I would go for a DD. But my opinion of what is best wil differ to someone else. My all round best recommendtion for a daily driver is a 3000/2.0. 3400+ is biassing on the track side. Any smaller and the gains are closer to stock, but they are still there.

spare tire

iTrader: (3)

mine is a 2.1 and it seems to hit pretty hard. W/ out drags I couldnt hook up at all tillabout 35mph. I also got the 3.23 rear gears. I would say not to go over a 2.2 STR. Thats just my two cents though

Full-Force

iTrader: (11)

How does Fuddle test the STR anyway? Somebody is lying because Yank says that only them (yank) and Precision can test STR.

MRZ28

iTrader: (15)

Bumb...

qwiktim

iTrader: (7)

Fuddle lying? Noooooooooooooo................... they've never done that......

Full-Force

iTrader: (11)

Not saying that its them that are lying. I just know that Yank says that anyone besides them and Precision Industries that advertises STR is making false claims. False claims = polite term for lie.

MNR-0

So I guess the thousands of converter manufacturers across the globe that use the Sonnex lookup charts for STR and STALL RPM based on mathematical and real-world research are lying too?

Get real...

Change the weight and power of a car, and the stall and STR changes. Its a crap shoot unless you get a custom made converter.

Full-Force

iTrader: (11)

I think you are preaching to the wrong congregation. Yank and Precision Industries are the only 2 I know of that are saying this.